The ordinal number matching the number 20 in a series.(noun)
One of 20 equal parts.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "twentieth" in a sentence
"To those of us who lead busy lives in the centers of what we call twentieth-century civilization, life in a place so isolated from the rest of the world as Tay Tay seems impossible."
"For even in this odd and musty world of phantoms which we call the twentieth century, there are times when a man finds himself in a certain place at"
"Short stories mostly set in twentieth-century Mississippi but some also in Rome."